Sound reproducing device



July 28, 1931. H. KUcHENMElsTER 1,816,782

SOUND REPRODUCING DEVISE i Filed Nov. 17. 1925 fx1/"en or:

Patented July v28, 1931 PATENT OFFICE HEINRICH KCHENM-EISTER, F BERLIN, GERMANY SOUND REPBODUCING DEVICE Application led November 17, 1926, Serial No. 148,922, and in Germany December 1, 1925.

This invention relates to a sound reproducing device, talkin machine or the like which is provided in a lrality of sound-boxes, the needles of which pass in succession over the same sound record at such intervals of time as to produce an improvement in the tone, each sound-box having its separate passage vfor guiding the sound. Talking machines are also known the sound passages of which are dii'erent from one another as regards their dimensions, shpe or material of their walls.

he object of the invention is to utilize the principles embodied in apparatus 'as hitherto proposed, in such a manner as to produce an improvement in the quality of the sound by tone colouring.

rlhis object is attained according tothe y present invention in talking machines of the ind first above referred to` by making the walls of the two or more separate sound pas-l sages .of different material in addition to making the said sound passages of different dimensions or of diii'erent form so that the length and nature of the individual sound passages shall differ from one another more or less considerably."-

The accompanyuiig drawings illustrate by way of example, di erent forms of construction of the sound passages according to the invention, Fi ure 1 illustrating in part sectional front e evation one form of constructionl and Figures 2 and 3 in part sectional front elevation and in side elevation res ectively the second form of construction. igure 4 shows in p-art sectional front elevation a talking machine having sound passages substantially similar in shape to those of'Figure 1, diii'ering from one another in material, shpe and thickness.

eferring to Figure 1 the trumpet c which is connected to the usual tone arm .a is con' structed in la known'manner. However, the second tone arm b leads to a trumpet d containing a chamber e of any desired shape, as regards its form and cross section, which chamber, owing to the sound pocketwhich it forms and by causin the sound to be reflected, blends the soun passing throu h the trumpet d, thereby producing a di erent own manner with a plu character of tone in the said trumpet, which tone in its turn substantially influences the tone resulting from the combination of the trumpets 0 and d.

The space e may be made angular. or be bent and may be adapted to the gradually conically increasing cross section of the trumpet, or be otherwise shaped so that the sound waves reach the opening of the trumpet parth ly b reflection and partly after having been poc eted. I

Referring to the form of construction illustrated in Figures 2 and 3, the tone arm a is connected to the trumpet c1 which is constructed in a known manner. The tone arm 65 b, however, leads to the trumpet d1 which is extended or constructed in a syphon-like fashion, thus forming a sound passage which is substantially longer and of diiierent cross section. In consequence thereof, the tone of the sound reaching the ears will be substantially diiferent, owing to its propagation being different from the propagation of the sound which lcomes from trumpet c1. The two trumpets together produce a combined tone, the richness of which is ensured by the different constructions of the trumpets.

The dimensions required for individual cases are determined experimentally according to the particular practical conditions. The horns may be made of sheet metal, wood, or materials composed of borings or shav. ings mixed with a binding agent, such as'f'gl artificial wood or cork Wood which is made from plaster and wood chips and the like, or artificial horns, Galalith, artificial rubber and the like or combinations of any of these materials or combinations of parts made of the same material but having av different thickness and consequently a different resonance.

In Figure 4, a and b are the tone arms, and 0 and d the trumpets, as in Figure 1. This figure also shows two sound boxes f and f1 95 carrying 'needles g and g1 passing in succession over the same sound record h. The sound boxes f and f1 are connected with the tone arms a and b respectively. The trumpet o is made of wood and is thicker than 101 the trumpet d, which is made of metal and. has a sound pocket e.

What I claim is l. A. talking machine for reproducing sound from a record, comprising a plurality of sound-reproducing diaphragme so mounted as to be operated simultaneously by successive points on one and t-he same record, and a plurality of sound passages entirely independent of one another, one connected With each diaphragm, the Walls of one of the sound passages differing constructionally from the Walls of another in such a Way as to aiiectthe quality of the sound.

2. A talking machine for reproducing sound from a record, comprising a plurality of sound-reproducing diaphragms so mounted as to be operated simultaneously by successive points on one and the same record, and a plurality of sound passages entirely independent of one another, one connected with each diaphragm, the Walls of one of the sound passages being made of a different material from the Walls of another.

8. A talking machine Jfor reproducing sound 'from a record, comprising a plurality of sound-reproducing diaphragms so mounted as to be operated simultaneously by successive points on one and the same record, and a plurality of sound passages entirely independent of one another, one connected with each diaphragm, one o the sound passages substantially diiering in shape from another.

4. A talking machine for reproducing sound from a record, comprising a plurality of sound-reproducing diaphragms so mounted as to be operated simultaneously by successive points on one and the same record, and a plurality of sound passages entirely independent of one another, one connected with each diaphragm, the Walls of one of the sound passages diiering in thickness from those of another.

5. A talking machine for reproducing sound from a record, comprising a plurality of sound-reproducing diaphragme so mounted as to be operated simultaneously by successive points on one and the-same record, a plurality of sound passages entirely independent o one another, one connected with each diaphragm, and a sound pocket in one only of the sound passages adapted to deect the sound Waves.

In testimony whereof I have signed my name to this specication.

HEINRICH KCHENMEISTER. 

